A study in PMC analyzed its validity for quantifying daily physical activity against the ActiGraph accelerometer. Where to Buy
Because the V800 is no longer in production, finding a new unit is difficult. You can typically find it through secondary markets and specialized retailers: Validation study of Polar V800 accelerometer - PMC buy polar v800
to be one of the most accurate sports watches for distance recording, showing no statistically significant difference from reference distances in diverse environments. A study in PMC analyzed its validity for